Categories of Aphasia: a cluster‐analysis of Schuell test profiles

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Abstract
Schuell test scores obtained from 86 aphasic cases were submitted to cluster-analysis, which is a mathematical and statistical way of picking out groups of subjects with similar profiles. The number of groups thus obtained was four, these groups being aligned along a dimension of severity. This finding therefore contradicts Schuell's claim that her test yields seven groups defined by symptomological pattern. However, it was found that the seven Schuell types bore a loose but systematic relationship to our four types (that we have labelled Severe, High-moderate, Low-moderate, and Mild) and it was also noted that Schuell herself had considered collapsing her types onto a severity-based system. Having described a typology far more mathematically sound than Schuell's, the theoretical implications of the results were discussed.

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